One of the most important things you need to do, regardless of the distance you are training for, is to teach your body to run when you are tired. That's why, in all of my plans, I will always include a run after an effort based day, or before a Long Slow Distance (LSD) day.
It's a fact that, during any race, you will come to the point when your legs are tired, but, if you have trained to run tired you will have the confidence to run through this period, and, quite often you will experience the 'Runners High' and get a boost by actually speeding up!
I have experienced this several times, and, as you will see if you have read my latest Blog post, I have, in the last 2/3 weeks actually beaten previous recent bests in training when I have literally had to force myself to go out cos either my legs were tired, or I just felt lethargic.
I am sure that this will benefit me in the Richard Burton 10k that I am doing on 4th Nov so don't get disheartened if you feel tired, just get out there and go for it. I promise you that you will get the benefit.